Project description

Certbot is part of EFF’s effort to encrypt the entire Internet. Secure communication over the Web relies on HTTPS, which requires the use of a digital certificate that lets browsers verify the identity of web servers (e.g., is that really google.com?). Web servers obtain their certificates from trusted third parties called certificate authorities (CAs). Certbot is an easy-to-use client that fetches a certificate from Let’s Encrypt—an open certificate authority launched by the EFF, Mozilla, and others—and deploys it to a web server.

Anyone who has gone through the trouble of setting up a secure website knows what a hassle getting and maintaining a certificate is. Certbot and Let’s Encrypt can automate away the pain and let you turn on and manage HTTPS with simple commands. Using Certbot and Let’s Encrypt is free, so there’s no need to arrange payment.

How you use Certbot depends on the configuration of your web server. The best way to get started is to use our interactive guide. It generates instructions based on your configuration settings. In most cases, you’ll need root or administrator access to your web server to run Certbot.

If you’re using a hosted service and don’t have direct access to your web server, you might not be able to use Certbot. Check with your hosting provider for documentation about uploading certificates or using certificates issued by Let’s Encrypt.

Certbot is a fully-featured, extensible client for the Let’s
Encrypt CA (or any other CA that speaks the ACME
protocol) that can automate the tasks of obtaining certificates and
configuring webservers to use them. This client runs on Unix-based operating
systems.

To see the changes made to Certbot between versions please refer to our
changelog.

Until May 2016, Certbot was named simply letsencrypt or letsencrypt-auto,
depending on install method. Instructions on the Internet, and some pieces of the
software, may still refer to this older name.

Contributing

Installation

The easiest way to install Certbot is by visiting certbot.eff.org, where you can
find the correct installation instructions for many web server and OS combinations.
For more information, see Get Certbot.

How to run the client

In many cases, you can just run certbot-auto or certbot, and the
client will guide you through the process of obtaining and installing certs
interactively.

For full command line help, you can type:

./certbot-auto --help all

You can also tell it exactly what you want it to do from the command line.
For instance, if you want to obtain a cert for example.com,
www.example.com, and other.example.net, using the Apache plugin to both
obtain and install the certs, you could do this:

Supports an interactive text UI, or can be driven entirely from the
command line.

Free and Open Source Software, made with Python.

For extensive documentation on using and contributing to Certbot, go to https://certbot.eff.org/docs. If you would like to contribute to the project or run the latest code from git, you should read our developer guide.